Pump jack



April 29, 1930.

L. G. NORDSTROM PUMP JACK 3 Sheets-Sheet 1 Filed Aug. 8, 1929 April 29, 1930. G.. NORDSTROM PUMP JACK Filed. Aug. 8, 1929 3 Sheets-Sheet 2 7 n Zia/lie GMmlsho o MOT/"0H0.

April 29, 1930. G. NORDSTROM PUMP JACK 5 Sheets-Sheet 3 Filed Aug. 8, 1929 r I 0 auomwqo.

Patented Apr. 29, 1930 UNrrEn STATES PATENT Fries LIITNIE e. NORDS'IROM, or GALVA, rumors, Ass'renon or Orr n-THIRD T'O EDWIN L. s'rnrnnnson, or GALVA, 'ILIIINO'IS PUMP JACK Application filed August 8, 1929.

This invention relates to pump jacks designed for actuating cylinder pumps at any angle, the jack being so constructed as to drive its pitman either upwardly, downward- 5 1y, horizontally, or at any intermediate angle found necessary.

Another object is to provide a jack the members'of which are so assembled as to adapt them for use in difierent positions to compensate for lost motion, and to actuate the pumprod properly whether or not it is mounted in a guide andwhether or not the parts are accurately adjusted.

A further object is to provide a jack that 15 is not only useful for the purposes stated but can also be employed as a rigging for different kinds of wood sawing apparatus, this being due to the fact thatthe jack will adapt itself to the path of movement of the saw and allow it to work properly along the line of cut.

still further object is to provide a jack utilizing a thrust equalizing means whereby motion isproperly transmitted from sepa rate rotating elements to a reciprocating element.

With the foregoing and other objects in view which will appear as the description 'roceeds, the invention resides in the com ination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed may be made within'th'e scope of what is claimed, without departing from the spirit of the invention. In'the accompanying drawings the preferred form of the invention has been shown.

In said drawings.

Figure 1 is a front elevation of the jack connected to a rod.

Figure 2 is an enlarged vertical longitudinal section through the gear housing of I the jack.

Figure 3 is an enlarged section on line 3-8, Figure 1.

Figure 4 is an enlarged section on line 4- -4, Figure 1.

1. Figure 5 is an enlarged section on line 55',

5'0 Figure 1.

Serial No. 384,274.

Figure 6 is an end elevation showing the jack arranged for driving horizontally.

Figure 7 is an elevation of the removable cover plate ofthe gear housing. A

Figure 8 is a top plan view of one of the housing pedestals.

Figure 9 is an elevation showing one side of a crank arm.

Figure 10 is an elevation showing the other side of the crank arm. I

Figure 11 is a section on line 11'11,Fig-- ure 10. v

Figure 12 is a; View partly in section and partly in front elevation of the lower portion of one of the pitmen.

Figure 13 is a section on line 13-13, Figure 12.

Figure 14 is a section on line 1414, Figure 1.

Figure 15 is a section on line 1515, F igure l.

Figure 16 is a view similar to Figure 14 but showing the parts differently arranged relative to each other for equalizing thrust from the two pitmen to the transmission rod.

Referring to the figures by characters of reference, ldesignates a housing that can be formed with a. central partition 2 extending transversely thereof. This housing may be cast with an open face,- said face being adapted to be closed by a cover plate or head 3. This late can be reinforced by transverse ribs 4? on the outer side thereof. Screwthreaded recesses 5 may be formed in the ribs for the purpose hereinafter explained.

The housing 1 has spaced bearing sleeves 6 extending perpendicularly from the closed side thereof and each sleeve has a bushing 7 in which is journaled a shaft 8. The sleeves 6 vmay be reinforced by integral webs 9 radiating therefrom and extending from the closed side of the housing.

Secured to that end of each shaft 8 located Within the housing is a gear 9 and these gears mesh with smaller gears 10 secured to a longitudinal shaft 11 that is journaled in the ends of the housing 1 and also in the partition 2. Another or drive shaft 12 is journaled in partition 2 and in one end of the housing 1 and has a gear 13 located close to the partition nected crank arms 16 each of which may be reinforced by a longitudinal rib 17 on one side'thereof. Extending through the arm and longitudinally of the rib is a series of apertures 18 and any one of the apertures of said series is adapted to receive a wrist pin 19 that can be in the form of a bolt.

The two gears 9 are adapted to be driven in opposite directions simultaneously by the gears10 when shaft 11 is rotated. The crank arms. 16 are extended oppositely and are adapted to rotate at the same speedsothat once during each rotation the'crank arms will be extended toward each other and aline While once during each rotation they .will be extended away from each other and aline. They will also simultaneously reach positions where they will be momentarily parallel.

Each wrist pin 19 is extended through a block 20 located between straps 21 to which the block is securedby a single bolt 22 ex tending through the block and the strap. This bolt is disposed at right angles to the wrist pin. The opening 23 provided for the wrist pin has been shown clearly in Figures 12 and 13. The straps 21 are bolted to opposite faces of a pitman 24. These pitmen are substantially parallel and those end portions thereof remote from the crank arm are formed with longitudinal series of apertures 25.

Fastened to the inner side of each pitman isa bracket 26.'these brackets being pref- .erably held adjustably to the pitmen by bolts 27 that can be extended through any of the apertures 25. Thus it is possible to arrange the brackets'at any desired distances from the crank arms. The brackets are extended toward each other and. their free ends are reduced to provide tongues 28 adapted to lap. Apivot bolt 29 may be extended throughthe lapping tongues and also through the base 30of a coupling 31. This base has spaced ears 32 adapted to receive between them one end of the transmission rod 33,

which can be a pump rod or the like, the said rod being held to the ears by a pivot bolt 34. If preferred, the brackets 26can be connected by two bolts 35 extending through the end portions of the base 30 of the coupling 31 and through apertures provided therefor in the brackets as indicated at 36. When these bolts 35 are employed the pivot bolt 29 is dispensed with. Thus the brackets 26 will When the pitmen areused for driving rod 7 use of the bolts .35.

can be arranged beneath the plate 3 and molded to the ribs 4, the screws employed being extended into the threaded socket 5 as shown in Figure 6. I 1

' l/Vhen'the apparatus is in either of these positions, actuation of shaft 12 will result in the transmission of motion to shaft 11 so that spring arms-16 will be actuated as already explained, thereby causing the pitmen 24 to reciprocate and oscillate. The oscillation of the-pitmen is relative to each other due to the fact that the crank arms rotate in opposite directions respectively. This relative oscillation of the pitmen during their reciprocation is permitted because of the pivotal connection between the brackets 26 and bolts 29 or because oft-he equalizing connection between "the brackets provided by'the This equalizing connection is employed usually when the rod 33 is mounted in afguide .alreadyprovided therefor and the jackis applied to the rod'for the purpose of actuating it.

Under the conditions just mentioned, it is almost impossible to mount the jack relative to'the path of movement of therod with sufficient accuracy to insure'a positive thrust against the rod along the line of travel thereof.Bylproviding the compensating crosshead formed of the brackets 26 connected by the coupling 31 and bolts 35, a limited relative movement of the parts is permitted in the cross-head so as to adapt the mechanism for use under the conditions stated and com- .1105

21, it becomes possible'tortransmit motion through the pitmen even thoughthey may be disposed at angles between the horizontal and vertical positions.

Whatisclaimedisx Y 1. A jack including a housing, crankarms supported outside thereof, means within the housing for rotating'the crank arms simultaneously but in opposite directions respec tively, means detachablyconnected to the housing forsupportingit in 'eithenof two positions, pitmen connected-to and adapted to be actuated simultaneously by the'respective crank arms, brackets adj ustably connected to the respective pistons, a coupling movably connected to the brackets,; and. a IOdi connected to and actuated by thecoupling.

2. A jack including a housing, means detachably connected thereto for supporting the housing in either of two positions, crank arms rotatable relative to the housing; means 1% in the housing for simultaneously rotating the crank arms in opposite directions respectively, blocks carried by the crank arms and adjustably connected thereto, pitmen pivotally connected to the respective blocks, brackets adjustably connected to the respective pitmen, a rod, and a working connection.

between the rod and the brackets.

3. A jack including a housing, means detachably connected thereto for supporting the housing in either of two positions, crank arms rotatable relative to the housing, means in the housing for simultaneously rotating the crank arms in opposite directions respectively, blocks carried by the crank arms and adjustably connected thereto, pitmen pivot-' ally connected to the respectiveblocks, brackets adjustably connected to the respective pitmen, a rod, and a working connection between the rod and the brackets, said connection including a coupling, pivotal connections between the coupling and the respective brackets, and a pivotal connection between the coupling and the rod, said brackets and pitmen being located at opposite sides of the rod and each pitman, with its bracket, being adapted to oscillate relative to the opposed pitman and bracket.

In testimony that I claim the foregoing as my own, I have hereunto aifixed my signature.

LINNIE G. NORDSTROM. 

